Traveling-grate furnace



` 2 sheets-sheet 1.

S.. D R A H O I R E L m `o u m TRAVELING GRATE FURNAGE.

Patented 001;. 16, 1894.

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FRANCIS l-I. RICHARDS, OF HARTFORD, CONNECTICUT, ASSIGNOR TO ECKLEY B.COXE, OF DRIFTON, PENNSYLVANIA TRAVELlNG-G RATE FU RNACE.

SPECIFICATION forming part of LettersPatent No. 527,448, dated October16, 1894. "Application filed November 27, 1893. Serial No. 492.053. (Nomodel.)

This invention relates to fuel-traveling;

ro grate mechanism for furnaces, the l objectof the invention being tofurnish in connection with a furnace, an eliicient non-rotaryfueltraveling grate adapted for carrying the fuel in a layer along inthe furnace after the manner of the endless traveling grate, orchaingrate, heretofore used forthat purpose.

.In `the drawings accompanying and forming a part of this specification,Figure l is a sectional side elevation of afurnaceembodyzo ing my`present improvements. Fig. 2 is a sectional plan Viewof the furnaceshowing the arrangement of the grate-bars and gratebar-actuatingmechanism. Fig. 3 is a transverse sectional elevation of the furnacetaken 2 5 in line aa, Fig. 1 showing the parts at the right hand of saidline as seen from a point at the left hand thereof. Fig. 4 is a detailview illustrating, in sectional side elevation,

a portion of the right hand end of the furnace 3o showing thegrateandactuating mechanism in a position differing somewhat `from that shown inFig. 1, said ligure being intended to y illustrate the operation of thedevices for imparting therequired traveling movement to 3 5 thegrate-bars. Fig. 5 is a cross-sectional detail View, on an enlargedscale, illustrating .the preferred form and arrangement of thegrate-bars.` e e A Similar characters designate like) parts in 4o allthe figures. e i, t

The furnace illustrated `in the drawings has the usual inclosing Wallsat the sides and ends thereof and is shown provided with an i ordinaryfurnace roof. The side-Walls are designated by 3` and` l, respectivelythe roof by 2, the usual bridge-wall by 5, and the front wall by 6. Atthe forwardend of the furnace this is provided with the fuel-supplyhopper H e. from which the -fuel is admitted toM the fur-` e `5cnace-chamber throughthe inclined chuteor opening '7, in a welll knownmanner,

l The furnace is provided with a reciprocatory fuel-traveling grate,designated in a general way by G, which grate is supported at itsends bysuitable transverse supports, on, having suitable guides m for guidingthe movements `ofsaid grate. `Airis supplied to the fuel upon the gratefrombelow in any suitable man` ner.` In practice, suitablegrate-bar-supporting rollers, as 9 and10will be provided at one 6o or`morepoints in thelength of the grate-bars for reducing the friction ofthe bars as they are moved longitudinally of the furnace.

My improved fuel-traveling grate consists of a series of grate-barssupported as before `6 5 described and adapted to have arelatively slowforward movement together, and to have separately, or successively, arelatively rapid backward movement.` The series of bars is carriedforward with a relatively slow movezo ment toward the left hand in Fig.l by means of suitable actuating devices,.as hereinafter described, andduring said forward movement of the majority of the series, the barsare, aportion of them ,at a time, retracted with a relatively rapidmovement to their original positions.` During this retractive movement,the fuel resting in almass spread in a layer upon the series of bars hasa greater resistance upon the several adjacent for- 8o wardly-movingbarsthan it has adhesion upon a backwardly-moving single bar. ITherefore the layer or mass of fuel remains, in practice, t unbroken bythe retraction of one bar at a time so long as one or more bars on eachside 8 5 of the retracting bar continue to move for- 1 ward together. yBy means `of this organiza- .v tion of mechanism the layer L of fuelresting on the bars is carried regularly forward, after the same manner,substantially, as by 9o the ordinary endless traveling grate.` Inpractice,the proper operation of the mechanism will be facilitated bysetting the grate somewhat inclined downwardly toward the rearward endthereof, as` indicated in the drawings, so that gravity will co-operatewith the forwardly-.moving bars to preventretraci. tion of the fuel bythe backwardly-moving e bars. t

In the preferred form thereof herein shown, roo

the grate mechanism `consists ofthe altere nate upper and lower bars 12and 13,

- positions, and beso ktimed-.in theirmovements which bars are shownsubstantially of the same construction set side by side with theexception that the so-called upper bars have each a cap-piece, 14, whilethe lower bars 13 have the supporting plates 15 underlying the edges ofthe cap-pieces of the upper bars 12. This arrangement is, shown bestinFig. 5 where the fuel is shown supported on said bars as in practice,the air being supplied to the fuel from below through the openings orair-spaces 16 and 1'7, which'openings are prevented from clogging by thearrangementv of the overlapping plates and caps 14. and 15,respectively.

As a means for imparting the, requisite movement to the grate-bars, Ihave provided in connection with each grate-bar a grate-bardriver, orcam, 19, which in the form thereof herein. shown, (see Fig. 4.-)consists of awheel having a relatively. long or eccentric camface, 2,5,by means of which a relatively slow forwardmovement is imparted to theygratebar, and a relatively short return-camface, 26, by. means of whicha relatively` rapid return-movement is imparted to thegrate-bar, whichcam-facesmaybe formed by grooving theface of the driver` or in any wellknown manner known tothe art.

The, grate-bars 12 and A13 are shown provided with rollersorstuds, 18,for engaging thecam-faces25and 26 of.I thegrate-bar-actuating.- cams, ordrivers, the drivers being herein. shown as grooved to form` said:camfaces. These` cams, orl drivers, arefshown placed upon a shaft, 20,that is carriedl in bearings in the walls of the furnace. Said shaft isshown provided 'at one end with the worm-wheel. 2l fixed thereon, whichwormwheel meshes with the worm 22 on thedriving-shaft 23 supported inAsuitable bearings and provided with a driving pulley 2*4.l whereby theentire mechanism may be actuated. As before stated the forwardmovementof l thegrate-bars is produced by thegradual incline or cam-face25 of the driver, while ther backward movement thereof is produced'- bythesteeper or shorter cam-face 26. In Fig. 4 thedriver is illustratedina dierent--position from that shown in Fig. l'for more fullysettingforth the operation of the mechanism', which will-be readilyunderstoodby comparison ofthe several figures-of the drawings` inconnection withv this` description thereof.v

In practice, the grate-bar-drivers will be secured to the shaft 20'inslightly varying as-to moveforward the majority ofA` the bars alltogether with a relatively'slowmovement and will: move others ofi saidbars backward with a relatively rapid movement, vwhich arrangement willbefnlly understood by anyfollows: The grate-actuating devices being rstarted in operation by operatively connecting the pulley 24 with somesuitable source of power, (as for instance, a suitable motor connectedby a belt, not shown) said devices actuate the several grate bars afterthe manner herein'oefore set forth and impart to them av general andrelatively slow forward movement of substantially uniform velocitythroughout the forward stroke thereof and impart to apart of them at atime successiveA and relatively rapid backward movements. i The fuelbeingsuppl-ied to the grate from the jhopper through the chu-te oropening 7, is carried forward on the grate in acontinuous layer, airbeing supplied to the fuel from below in any suitable'manner tofacilitate combustion thereof, after-*which the ash and cinder aredischarged over the rear end of the a grate-bars. f I claim- 1. Afuel-traveling grateforfurnacesoni sisting of a series of grate-barssupported for longitudinal movement, combined withl ro- 1 tary driversand connectionssubstantiallyas described for imparting a gradual andrelai tively slow` longitudinal forwardmovement to the series of bars,and adaptedfor-i'mparting a relatively rapidbackward movement-to i aportion onlyI of thebars at a time, and: means 'I for rotating said"drivers, substantially asde.- .i scribed and for the purpose set forth.

2. The herein described fueltraveling 1 grate forfurnaces, it consistingofl a series of lbarssupported'and adapted for longitudinal 'movemen-t,in` combination with bar-actuat- -ing devices which consistofdifferently dis- Iposed revolubledrivers having successive long andshort cam-faces adapted respectivelyfor-imparting a relatively slowforward longitudinal' movement to the majority of the ygrate-bars, andfor imparting a relatively -rapid` backward movement to said ba-rs, in 1dependently or successively, andY connectingdevices between4 thegrate-bars and their-- f drivers and in constant bearing-contact withthe bearingfacesthereof, substantially as-described and for the purposeset forth.

3. In a furnace, in combination, a series of j positions alongsaidshaft-'whereby a revolution of said actuatorswill impart a generalrelatively slow advancmg-movement, and y successive relatively rapidlreturn-movement l to said-grate-bars, substantially as described.

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4. A fuel-traveling grate for furnaces comprising a vseries of lowergrate-bars having fuel-supporting top plates, a series of uppergrate-bars having top plates in longitudinal 5 parallelism with andpartially overlapping the top plates of the lower grate-bars and sodisposed as to leave air-spaces between said plates, substantially asdescribed, combined with rotary drivers and connections for imlo partinga relatively slow and gradual forward movement to theseries of bars andadapted for imparting a relatively rapid backward movement to a portiononly of the bars at a time, and means for rotating said drivers,substantially as described and for the pur` I5 pose set forth.

FRANCIS H. RICHARDS. Witnesses:

FRED. J. DOLE, .FREDERICK A. ROLAND.

